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Scanning optical system, optical scanning device and radiographic image reading apparatus

a scanning optical system and scanning optical technology, applied in the direction of material analysis using wave/particle radiation, instruments, x/gamma/cosmic radiation measurement, etc., can solve the problem of increasing the size of the optical scanning device, difficult to use these scanning optical systems in combination with a galvanometer mirror, and difficulty in setting a sufficiently small beam diameter of not greater than 36 m on the surface to be scanned. , to achieve the effect of downsizing the optical scanning devi

Inactive Publication Date: 2015-01-08
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a scanning optical system that can be used in various applications. The system has two main advantages: it allows for a small beam diameter, which means that the system can be made smaller, and it satisfies a condition that ensures a stable scanning process. The system includes three spherical lenses and uses a specific equation to set the beam diameter. The technical effects of this invention include improved performance and reduced size of the optical scanning device.

Problems solved by technology

However, with the scanning optical system disclosed in Patent Document 2, it is difficult to set a sufficiently small beam diameter of not greater than 36 μm on a surface to be scanned, as described above.
The scanning optical system disclosed in Patent Document 3 has a large optical path length of the entire system, and this may likely to lead to increased size of the optical scanning device.
The scanning optical systems disclosed in Patent Documents 4 and 5 have a large angle of view, and therefore it is difficult to use these scanning optical systems in combination with a galvanometer mirror, which has a relatively small range of deflection angle, typically 40° (±20° from the center of the reciprocating motion for deflection), when compared to a polygon mirror, etc.

Method used

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  • Scanning optical system, optical scanning device and radiographic image reading apparatus
  • Scanning optical system, optical scanning device and radiographic image reading apparatus
  • Scanning optical system, optical scanning device and radiographic image reading apparatus

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068]FIG. 1 shows a sectional view of the scanning optical system of Example 1. It should be noted that details of FIG. 1 are as explained above and the same explanation is not repeated in the following description unless otherwise necessary. The scanning optical system of Example 1 includes, in order from the light beam entrance side toward the surface to be scanned side, the mirror 4a of the galvanometer mirror 4, the positive first lens L1 which is a meniscus lens, the negative second lens L2 which is a biconcave lens, and the positive third lens L3 which is a meniscus lens.

[0069]Table 1 shows basic lens data of the scanning optical system of Example 1. In the following description, the mirror 4a side viewed from the elements disposed between the mirror 4a and the surface to be scanned 7 is referred to as “rear side” and the surface to be scanned 7 side is referred to as “front side”. In Table 1, each value in the column of “Si” represents the surface number of the i-th (i=1, 2,...

example 2

[0071]FIG. 2 shows a sectional view of a scanning optical system of Example 2. The scanning optical system of Example 2 includes, in order from the light beam entrance side toward the surface to be scanned side, the mirror 4a of the galvanometer mirror 4, the positive first lens L1 which is a meniscus lens, the negative second lens L2 which is a biconcave lens, and the positive third lens L3 which is a meniscus lens. Table 2 shows basic lens data of the scanning optical system of Example 2.

TABLE 2Example 2: Lens DataWavelength 660 nm, Deflection angle 40°(±20°), Aperture diameter Φ10 mmSiRiDiNdjνdj(Surface(Radius of(Surface(Refractive(Abbenumber)curvature)distance)index)number)119.0452−269.85947.5521.7282528.323−46.6341.9924−42.7925.0011.5168064.205312.44342.0576254.69423.5941.5168064.2073630.594510.761

example 3

[0072]FIG. 3 shows a sectional view of a scanning optical system of Example 3. The scanning optical system of Example 3 includes, in order from the light beam entrance side toward the surface to be scanned side, the mirror 4a of the galvanometer mirror 4, the positive first lens L1 which is a meniscus lens, the negative second lens L2 which is a biconcave lens, and the positive third lens L3 which is a biconvex lens. Table 3 shows basic lens data of the scanning optical system of Example 3.

TABLE 3Example 3: Lens DataWavelength 660 nm, Deflection angle 40°(±20°), Aperture diameter Φ10 mmSiRiDiNdjνdj(Surface(Radius of(Surface(Refractive(Abbenumber)curvature)distance)index)number)144.9862−198.96521.5141.7282528.323−51.1204.5194−47.4395.0001.5168064.205631.12737.3856302.96636.6521.5168064.207−695.289499.945

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PUM

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Abstract

A scanning optical system that can be made compact and can provide a sufficiently small beam diameter on a surface to be scanned is provided. In a scanning optical system including a galvanometer mirror that reflects and deflects a light beam emitted from a light source and a fθ lens that focuses the deflected light beam on a surface to be scanned, the fθ lens includes, in order from the galvanometer mirror side, a first lens which is a spherical lens having a positive refractive power, a second lens which is a spherical lens having a negative refractive power, and a third lens which is a spherical lens having a positive refractive power. The fθ lens satisfies conditional expression (1) below:1.542≦f / f1≦7.828  (1),where f is a focal length of the entire fθ lens system, and f1 is a focal length of the first lens.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2013-141465, filed on Jul. 5, 2013. The above application is hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an optical scanning device for scanning a surface to be scanned made of a recording material, or the like, with a light beam.[0004]The invention also relates to a scanning optical system including a fθ lens for use with the above-described optical scanning device.[0005]The invention also relates to a radiographic image reading apparatus for reading a radiographic image, which is recorded on a stimulable phosphor sheet, using the above-described optical scanning device.[0006]2. Description of the Related Art[0007]Conventionally, various optical scanning devices are provided, which include a mechanical ...

Claims

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Application Information

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IPC IPC(8): G01T1/20G02B13/00G02B26/10
CPCG01T1/2014G02B13/0005G02B26/105G02B9/14
Inventor ISHIKAWA, HIROMIOHTA, YASUNORIINOUE, TOMOKI
Owner FUJIFILM CORP